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2 definitions by Bradley and The Cosmonauts

 
1.
The act of lifting a womans hair, ejaculating on her head in the spot revealed by lifting her hair, and releasing her hair back over the semen.
"But baby, it's The Bump It. You said you wanted more volume in your (hair)do."
by Bradley and The Cosmonauts January 02, 2010
 
2.
A sexual finishing move, usually done at the end of oral sex.

When one ejaculates in to their hand, slaps their partner across the face with the semen filled hand, and comes back with a chop. This is all one motion, using the same hand. Yelling "Slap-Chop" is optional.
"Dude, do The Slap-Chop to her."
by Bradley and The Cosmonauts January 02, 2010